USB to serial RS232 adapters are often used with consumer, commercial and industrial applications and USB-to-serial RS-485/422 adapters are usually mainly used only with industrial applications. The older serial RS423 protocol is rarely used any more, so USB to RS423 adapters are less common. Most commonly the USB data signals are converted to either RS-232, RS-485, RS-422, or TTL-level UART serial data. A USB-to-serial adapter or simply USB adapter is a type of protocol converter that is used for converting USB data signals to and from serial communications standards ( serial ports).
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